Finding the Fourth Proportional to 6,109.78, 8,431.28 and 3,457.02

Step by Step Solution

1. Step 1: Write the proportion equation
   6,109.78 : 8,431.28 = 3,457.02 : x
2. Step 2: Convert to fraction form
   6,109.78/8,431.28 = 3,457.02/x
3. Step 3: Cross multiply
   6,109.78x = 8,431.28 × 3,457.02
4. Step 4: Simplify right side
   6,109.78x = 29,147,103.59
5. Step 5: Solve for x
   x = 29,147,103.59/6,109.78
6. Step 6: Final answer
   x = 4,770.57